CN112134127B - Air-cooled cladding pump high-power optical fiber amplifier - Google Patents
Air-cooled cladding pump high-power optical fiber amplifier Download PDFInfo
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- CN112134127B CN112134127B CN202011037397.3A CN202011037397A CN112134127B CN 112134127 B CN112134127 B CN 112134127B CN 202011037397 A CN202011037397 A CN 202011037397A CN 112134127 B CN112134127 B CN 112134127B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0404—Air- or gas cooling, e.g. by dry nitrogen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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Abstract
The invention provides an air-cooled cladding pump high-power optical fiber amplifier which comprises a rare earth-doped optical fiber, a clamp and an air guide tube, wherein the rare earth-doped optical fiber comprises a fiber core and a cladding, the cladding is positioned on the outer side of the fiber core, the air guide tube is sleeved on the outer side of the rare earth-doped optical fiber, the left end and the right end of the rare earth-doped optical fiber are respectively and fixedly connected with the air guide tube through a plurality of clamps, a gap is formed between the outer wall of the cladding and the inner wall of the air guide tube, flowing gas is injected into the gap, and the gas flows in the gap to take away heat on the surface of the rare earth-doped optical fiber. The invention discloses a rare earth doped optical fiber amplifier structure which is capable of dissipating heat in an air cooling mode and suitable for high-power cladding pumping amplification.
Description
Technical Field
The invention relates to the technical field of lasers, in particular to an air-cooled cladding pumped high-power optical fiber amplifier.
Background
The double-clad (or multi-clad) rare earth-doped fiber refers to a rare earth-doped fiber having a core, cladding (or multi-clad), and coating structure, which is shown in fig. 1A and 1B. The fiber core is usually a single-mode or few-mode fiber, is doped with rare earth elements and has the functions of absorbing pump light and amplifying signal light; the cladding is a multimode fiber, which is beneficial to the coupling and transmission of the high-power multimode pump; the coating layer is a polymer material with a low refractive index.
The refractive index of the core of the double-clad rare earth-doped fiber needs to be higher than that of the cladding, so that single-mode (or few-mode) signal light can be conducted. The cladding layer may be composed of a coating layer or a new cladding layer, and the refractive index of the coating layer or the new cladding layer is lower than that of the inner cladding layer, so as to realize the conduction of the multimode pump light.
The high-power optical fiber amplifier has the advantages of high efficiency, easy maintenance and the like. The method is widely applied to the fields of industrial cutting, punching, carving, physics, biology, chemical control reaction, optical communication and the like. The implementation of high power fiber amplifiers relies on the use of high power multimode pumping and cladding pumping techniques. In the cladding pumped amplifying structure: the signal light is transmitted and amplified in the core of the double-cladding (or multi-cladding) rare earth-doped fiber, and the pump light is transmitted in the cladding of the rare earth-doped fiber and absorbed by the core.
The cladding pumped fiber amplifier can adopt a forward pumping structure, a backward pumping structure or a bidirectional pumping structure, and takes the forward pumping structure as an example, the amplifier generally adopts a structure of a dichroic mirror and a lens to realize the coupling of the pumping and the fiber cladding and the signal and the fiber core.
High power fiber lasers have been able to output power in excess of 100kW, which is typically achieved through multiple stages of beam combining. The output of a single stage fiber amplifier can already reach several kw. Although the efficiency of fiber lasers is higher than other types of lasers, it is inevitable that the temperature rises during amplification. Along with the gradual increase of the output power of the amplifier, the requirements on the temperature resistance and the heat dissipation performance of the optical fiber are higher and higher.
Currently, the low refractive index coating layer of the double-clad (or multi-clad) rare earth-doped optical fiber can be made of a material such as acrylic resin, which has poor temperature resistance and thermal conductivity. The conditions of uneven coating, coating defects and excessive coating can occur in the process of manufacturing the coating layer of the optical fiber, the defects can cause local overheating of the optical fiber, and when the temperature of the coating material reaches a certain degree, the coating layer of the optical fiber can be burnt and damaged usually, so that the laser is damaged. The double-clad (or multi-clad) rare earth-doped optical fiber is usually coiled and fixed on a water-cooled metal plate by using an adhesive tape or heat-conducting silica gel, and heat is dissipated by a water-cooling mode. However, because the coating layer of the optical fiber has poor thermal conductivity, the contact surface between the optical fiber and the heat dissipation surface is small, and the heat dissipation efficiency of the water cooling method is greatly reduced.
With the increasing power of lasers, the requirements for optical fibers are increasing. The design of the ultrahigh power amplifier puts higher requirements on the fault tolerance of the process defects of the optical fiber coating layer and the heat dissipation of the optical fiber. Too high a temperature of the coating layer can cause combustion of the coating layer, and too high a temperature at the fiber core can cause instability of an output mode. Along with the improvement of the laser productivity, higher requirements are put forward on the laser manufacturing and debugging efficiency. Conventional amplifier structures have not been able to meet the production requirements of high power laser amplifiers.
Disclosure of Invention
In view of this, the present invention provides an air-cooled cladding pumped high-power optical fiber amplifier, which improves the heat dissipation efficiency of the optical fiber and reduces the process manufacturing requirements for the optical fiber.
The invention provides an air-cooled cladding pump high-power optical fiber amplifier which comprises a rare earth-doped optical fiber, a clamp and an air guide tube, wherein the rare earth-doped optical fiber comprises a fiber core and a cladding, the cladding is positioned on the outer side of the fiber core, the air guide tube is sleeved on the outer side of the rare earth-doped optical fiber, the left end and the right end of the rare earth-doped optical fiber are respectively and fixedly connected with the air guide tube through a plurality of clamps, the clamps play a role of fixing the rare earth-doped optical fiber but do not block the circulation of air, a gap is formed between the outer wall of the cladding and the inner wall of the air guide tube, flowing air is injected into the gap, and the air flows in the gap to take away the heat on the surface of the rare earth-doped optical fiber to realize heat dissipation.
Further, the flowing direction of the gas is the same as or opposite to the input direction of the signal light and the pumping light.
Furthermore, the optical fiber amplifier also comprises a first dichroic mirror and a first coupling lens, wherein the first dichroic mirror, the first coupling lens and the rare earth-doped optical fiber are sequentially arranged from left to right, and the signal light which is reflected by the first dichroic mirror and focused by the first coupling lens is coupled into a fiber core of the rare earth-doped optical fiber; the pumping light which is transmitted by the first dichroic mirror and focused by the first coupling lens is coupled into the cladding of the rare earth doped fiber.
Furthermore, the optical fiber amplifier also comprises a second coupling lens and a second dichroic mirror, the first coupling lens, the rare earth-doped optical fiber, the second coupling lens and the second dichroic mirror are sequentially arranged from left to right, and a small hole is formed in the middle of the air guide tube.
Furthermore, the optical fiber amplifier also comprises an optical fiber combiner, the optical fiber combiner is welded with the rare earth-doped optical fiber, the optical fiber combiner couples the signal light into the fiber core of the rare earth-doped optical fiber, and the optical fiber combiner couples the pump light into the cladding of the rare earth-doped optical fiber.
Furthermore, one end of the clamp is bonded with the outer wall of the cladding, and the other end of the clamp is bonded with the inner wall of the air duct.
Further, the clamp is a metal rod, a glass rod or a ceramic rod.
Furthermore, the left end and the right end of the rare earth-doped optical fiber are respectively welded with end caps in a fusion mode, screws are selected for the fixture, first bolt holes are formed in each end cap respectively, second bolt holes corresponding to the first bolt holes in a one-to-one mode are formed in the air guide tube, and the screws are inserted into the first bolt holes and the second bolt holes to connect the air guide tube and the end caps through bolts.
Further, the gas is selected from air, nitrogen, inert gas (such as helium, neon, argon, etc.) or other gases that can be used for air cooling.
Further, the diameter of the core is larger than 5 μm, the diameter of the cladding is larger than 100 μm, and the core is doped with any one of rare earth elements such as erbium, ytterbium, neodymium and holmium; the cladding is a glass cladding.
Further, the rare earth doped optical fiber is a polarization maintaining optical fiber or a non-polarization maintaining optical fiber.
Further, the diameter of the end cap is greater than or equal to the diameter of the rare earth doped optical fiber.
Furthermore, the air duct is a glass air duct with the inner diameter of 8 mm.
Further, the first dichroic mirror and the second dichroic mirror reflect signal light, transmit pump light, or reflect pump light, transmit signal light.
Furthermore, the structure of the optical fiber amplifier is a structure with pumping and reflection in the same direction, pumping and signal reverse direction or bidirectional pumping.
The technical scheme provided by the invention has the beneficial effects that: the invention discloses a rare earth doped optical fiber amplifier structure which is capable of dissipating heat in an air cooling mode and is suitable for high-power cladding pumping amplification, signal light is transmitted and amplified in a fiber core of a rare earth doped optical fiber, pump light is transmitted in a cladding of the rare earth doped optical fiber and absorbed by the fiber core, and air-cooled gas flows between the rare earth doped optical fiber and an air duct to dissipate heat of the optical fiber; according to the optical fiber amplifier structure, the coating layer of the rare earth-doped optical fiber which is not high in temperature resistance is removed, air or other gases are used for carrying out air cooling heat dissipation on the optical fiber, on one hand, the air used for air cooling has low refractive index, and transmission of pump light in the cladding of the rare earth-doped optical fiber can be achieved; on the other hand, clean cold air circulates on the surface of the optical fiber, so that heat on the surface of the optical fiber can be taken away, heat dissipation of the optical fiber can be realized, the heat which can be born by the cladding pumped optical fiber amplifier can be fully optimized, and the existing limit of power which can be realized by the rare earth-doped optical fiber amplifier is broken through.
Drawings
Fig. 1 is a schematic structural view of a conventional double-clad optical fiber.
Fig. 2 is a schematic structural diagram of an air-cooled cladding-pumped high-power optical fiber amplifier provided in embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of an air-cooled cladding pumped high-power optical fiber amplifier provided in embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of an air-cooled cladding-pumped high-power optical fiber amplifier provided in embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings and examples.
Example 1:
referring to fig. 2, an embodiment 1 of the present invention provides an air-cooled cladding-pumped high-power fiber amplifier, including a first dichroic mirror 1, a first coupling lens 2, a rare-earth-doped fiber 3, a fixture 4, and an air duct 5, where the first dichroic mirror 1, the first coupling lens 2, and the rare-earth-doped fiber 3 are sequentially disposed from left to right.
The first dichroic mirror 1 reflects signal light with a central wavelength of 1030nm and transmits pump light with a central wavelength of 976nm, and the diameter of the first dichroic mirror 1 is 25 mm; the first coupling lens 2 has a diameter of 25mm and a focal length of 30 mm.
The rare earth-doped optical fiber 3 comprises a fiber core 31 and a cladding 32, wherein the cladding 32 is positioned on the outer side of the fiber core 31, the diameter of the fiber core 31 is 25 μm, and the diameter of the cladding 32 is 250 μm; the air guide tube 5 is sleeved on the outer side of the rare earth doped optical fiber 3, the inner wall of the air guide tube 5 is not contacted with the outer wall of the cladding 32, a gap 51 is formed between the inner wall of the air guide tube 5 and the outer wall of the cladding 32, the clamp 4 is arranged between the rare earth doped optical fiber 3 and the air guide tube 5 and used for fixing the rare earth doped optical fiber 3, the left end and the right end of the rare earth doped optical fiber 3 are fixedly connected with the air guide tube 5 through the plurality of clamps 4 respectively, one end of the clamp 4 is bonded with the outer wall of the cladding 32 through glue, and the other end of the clamp 4 is bonded with the inner wall of the air guide tube 5 through glue; in this embodiment, the gas-guide tube 5 is a glass gas-guide tube with an inner diameter of 8mm, the fixture 4 can be a metal rod, a glass rod or a ceramic rod, and the left end and the right end of the rare earth doped optical fiber 3 are respectively provided with three fixtures 4 with a length of 3.875 mm. Preferably, the triangle formed by the bonding points between the clamp 4 and the gas guide tube 5, which are arranged at the left end or the right end of the rare earth doped fiber 3, is an acute triangle, so that the rare earth doped fiber 3 and the gas guide tube 5 are stably connected.
The working process of transmitting signal light by using the optical fiber amplifier provided in embodiment 1 is as follows: the single-mode signal light with the central wavelength of 1030nm and the light spot diameter of 2mm is collimated and firstly reflected by the first dichroic mirror 1, the incident angle between the signal light and the first dichroic mirror 1 is 45 degrees, the included angle between emergent light and incident light of the signal light reflected by the first dichroic mirror 1 is 90 degrees, the reflected signal light is focused by the first coupling lens 2 and then coupled into the fiber core 31 of the rare earth-doped optical fiber 3, the coupling efficiency is higher than 95%, and the optical path from the first coupling lens 2 to the rare earth-doped optical fiber 3 is about 30 mm.
The working process of transmitting pump light by using the optical fiber amplifier provided in embodiment 1 is as follows: the collimated multimode pump light with the central wavelength of 976nm and the light spot diameter of 15mm firstly passes through the first dichroic mirror 1, the incident angle of the pump light and the first dichroic mirror 1 is 45 degrees, the pump light is transmitted through the first dichroic mirror 1, the transmission direction is not changed, the pump light is focused through the first coupling lens 2 and then coupled into the cladding 32 of the rare earth doped optical fiber 3, and the coupling efficiency is higher than 95%.
In the operation of the optical fiber amplifier provided in embodiment 1, clean cold air is continuously injected into the gap 51 between the air guide tube 5 and the cladding 32 from the signal output end of the optical fiber amplifier, the cold air entering the gap 51 flows out from the signal input end, the cold air carries away heat from the surface of the rare-earth doped optical fiber 3 during the flowing process, and the hot air flowing out from the signal input end is discharged to the outside of the optical fiber amplifier.
Example 2:
referring to fig. 3, an embodiment 2 of the present invention provides an air-cooled cladding-pumped high-power fiber amplifier, including a first dichroic mirror 1, a first coupling lens 2, a rare-earth-doped fiber 3, a fixture 4, an air duct 5, a second coupling lens 6, and a second dichroic mirror 7, wherein the first dichroic mirror 1, the first coupling lens 2, the rare-earth-doped fiber 3, the second coupling lens 6, and the second dichroic mirror 7 are sequentially disposed from left to right.
The first dichroic mirror 1 and the second dichroic mirror 7 reflect signal light with a central wavelength of 1030nm and transmit pump light with a central wavelength of 976nm, and the diameter of the first dichroic mirror 1 and the second dichroic mirror 7 is 25 mm; the first coupling lens 2 and the second coupling lens 6 have a diameter of 25mm and a focal length of 30 mm.
The rare earth-doped optical fiber 3 comprises a fiber core 31 and a cladding 32, the cladding 32 is positioned on the outer side of the fiber core 31, and the left end and the right end of the rare earth-doped optical fiber 3 are respectively welded with the end caps 8; the gas guide tube 5 is sleeved on the outer side of the rare earth doped optical fiber 3, a small hole 52 is formed in the middle of the gas guide tube 5, the inner wall of the gas guide tube 5 is not in contact with the outer wall of the cladding 32, a gap 51 is formed between the inner wall of the gas guide tube 5 and the outer wall of the cladding 32, the clamps 4 are arranged between the gas guide tube 5 and the end caps 8, each end cap 8 is fixedly connected with the gas guide tube 5 through the clamps 4, and the distance between the inner wall of the gas guide tube 5 and the end caps 8 is 1 mm; in this embodiment, the air duct 5 is a glass air duct with an inner diameter of 8mm, the end cap 8 is a quartz glass end cap with a diameter of 6mm and a length of 3mm, and the clamp 4 is a screw. Preferably, four first bolt holes 81 are respectively and uniformly formed along the outer side of each end cap 8, second bolt holes 53 corresponding to the first bolt holes 81 in position one by one are formed in the air guide tube 5, and screws are inserted into the first bolt holes 81 and the second bolt holes 53 to bolt the air guide tube 5 and the end caps 8.
The working process of transmitting signal light by using the optical fiber amplifier provided in embodiment 2 is as follows: the method comprises the following steps that collimated single-mode signal light with the central wavelength of 1030nm and the light spot diameter of 2mm is firstly reflected through a first dichroic mirror 1, the incident angle between the signal light and the first dichroic mirror 1 is 45 degrees, the included angle between emergent light and incident light of the signal light after being reflected through the first dichroic mirror 1 is 90 degrees, the reflected signal light is focused through a first coupling lens 2 and then coupled into a fiber core 31 of a rare earth-doped optical fiber 3, the coupling efficiency is higher than 95%, and the optical path from the first coupling lens 2 to the rare earth-doped optical fiber 3 is about 30 mm; the signal light amplified by the rare earth-doped fiber 3 is emitted from the output end of the rare earth-doped fiber 3, is collimated into collimated single-mode signal light with the light spot diameter of about 2mm by the second coupling lens 6, and is reflected by the second dichroic mirror 7, the incident angle between the signal light and the second dichroic mirror 7 is 45 degrees, and the included angle between the emergent light and the incident light after the signal light is reflected by the second dichroic mirror 7 is 90 degrees.
The working process of transmitting pump light by using the optical fiber amplifier provided in embodiment 2 is as follows: wherein, one path of collimated multimode pump light with the central wavelength of 976nm and the spot diameter of 15mm firstly passes through the first dichroic mirror 1, the incident angle of the pump light and the first dichroic mirror 1 is 45 degrees, the pump light is transmitted through the first dichroic mirror 1, the transmission direction is not changed, the pump light is focused through the first coupling lens 2 and then coupled into the cladding 32 of the rare earth doped optical fiber 3, and the coupling efficiency is more than 95%; the other path of collimated multimode pump light with the central wavelength of 976nm and the light spot diameter of 15mm is coupled into the cladding 32 of the rare earth-doped fiber 3 from the output end of the rare earth-doped fiber 3, the reverse pump firstly passes through the second dichroic mirror 7, the incident angle between the pump light and the second dichroic mirror 7 is 45 degrees, the pump light is transmitted through the second dichroic mirror 7, the transmission direction is not changed, the pump light is focused through the second coupling lens 6 and then coupled into the cladding 32 of the rare earth-doped fiber 3, and the coupling efficiency is higher than 95%.
In the operation of the optical fiber amplifier provided in example 2, the cool air is continuously injected into the gap 51 between the air guide tube 5 and the cladding 32 through the small holes 52, the cool air entering the gap 51 flows out from both ends of the rare-earth doped fiber 3, the cool air removes heat from the surface of the rare-earth doped fiber 3 during the flow in the gap 51, and the hot air flowing out from both ends of the rare-earth doped fiber 3 is discharged to the outside of the optical fiber amplifier.
Example 3:
referring to fig. 4, embodiment 3 of the present invention provides an air-cooled cladding-pumped high-power optical fiber amplifier, which includes an optical fiber combiner 9, a rare-earth-doped optical fiber 3, a clamp 4, and an air guide tube 5.
The optical fiber combiner 9 is composed of passive optical fibers, the passive optical fibers are common passive optical fibers with fiber cores, cladding (or multi-cladding) and coating structures, the optical fiber combiner takes a plurality of passive optical fibers as input ends, one cladding (or multi-cladding) non-rare earth-doped passive optical fiber as an output end, and the output end of the optical fiber combiner 9 is connected with the rare earth-doped optical fiber 3 in a fusion mode.
The rare earth-doped optical fiber 3 comprises a fiber core 31 and a cladding 32, wherein the cladding 32 is positioned on the outer side of the fiber core 31, the diameter of the fiber core 31 is 25 μm, and the diameter of the cladding 32 is 250 μm; the air guide tube 5 is sleeved on the outer side of the rare earth doped optical fiber 3, the inner wall of the air guide tube 5 is not contacted with the outer wall of the cladding 32, a gap 51 is formed between the inner wall of the air guide tube 5 and the outer wall of the cladding 32, the clamp 4 is arranged between the rare earth doped optical fiber 3 and the air guide tube 5 and used for fixing the rare earth doped optical fiber 3, the left end and the right end of the rare earth doped optical fiber 3 are fixedly connected with the air guide tube through the plurality of clamps 4 respectively, one end of the clamp 4 is bonded with the outer wall of the cladding 32 through glue, and the other end of the clamp 4 is bonded with the inner wall of the air guide tube 5 through glue; in this embodiment, the gas-guide tube 5 is a glass gas-guide tube with an inner diameter of 8mm, the fixture 4 can be a metal rod, a glass rod or a ceramic rod, and the left end and the right end of the rare earth doped optical fiber 3 are respectively provided with three fixtures 4 with a length of 3.875 mm. Preferably, the triangle formed by the bonding points between the clamp arranged at the left end or the right end of the rare earth doped optical fiber 3 and the gas guide tube 5 is an acute triangle, so that the rare earth doped optical fiber 3 is stably connected with the gas guide tube 5.
The working process of transmitting signal light by using the optical fiber amplifier provided in embodiment 3 is as follows: the signal light is coupled into the fiber core 31 of the rare earth doped fiber 3 through the fiber combiner 9.
The working process of transmitting pump light by using the optical fiber amplifier provided in embodiment 3 is as follows: the pump light is coupled into the cladding 32 of the rare-earth doped fiber 3 via a fiber combiner 9.
In the operation of the optical fiber amplifier provided in embodiment 1, clean cold air is continuously injected into the gap 51 between the air guide tube 5 and the cladding 32 from the signal output end of the optical fiber amplifier, the cold air entering the gap 51 flows out from the signal input end, the cold air carries away heat from the surface of the rare-earth doped optical fiber 3 during the flowing process, and the hot air flowing out from the signal input end is discharged to the outside of the optical fiber amplifier.
In fig. 2 to 4, the dotted arrows indicate the direction of the flow of the cool air.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides an air-cooled cladding pumping high power fiber amplifier, its characterized in that, is including mixing tombarthite optic fibre, anchor clamps and air duct, mix tombarthite optic fibre and constitute by fibre core and cladding, the cladding is located the outside of fibre core, the outside of mixing tombarthite optic fibre is established to the air duct cover, mix tombarthite optic fibre's left end and right-hand member respectively through many anchor clamps and air duct fixed connection, form the space between the outer wall of cladding and the inner wall of air duct, inject mobile gas in the space, the heat on tombarthite optic fibre surface is taken away in the gas flows in the space.
2. The air-cooled cladding-pumped high-power optical fiber amplifier of claim 1, wherein said optical fiber amplifier further comprises a first dichroic mirror and a first coupling lens, said first dichroic mirror, said first coupling lens and said rare-earth-doped optical fiber being arranged in order from left to right.
3. The air-cooled cladding-pumped high-power optical fiber amplifier of claim 2, wherein the optical fiber amplifier further comprises a second coupling lens and a second dichroic mirror, the first coupling lens, the rare-earth-doped optical fiber, the second coupling lens and the second dichroic mirror are sequentially arranged from left to right, and the middle of the air duct is provided with a small hole.
4. The air-cooled cladding-pumped high power fiber amplifier of claim 1, further comprising a fiber combiner fused to the rare earth-doped fiber, the fiber combiner coupling signal light into the core of the rare earth-doped fiber, the fiber combiner coupling pump light into the cladding of the rare earth-doped fiber.
5. The air-cooled cladding-pumped high-power optical fiber amplifier according to any one of claims 2 to 4, wherein one end of the clamp is bonded to the outer wall of the cladding, and the other end of the clamp is bonded to the inner wall of the air-guide tube.
6. The air-cooled cladding-pumped high-power optical fiber amplifier of claim 5, wherein the clamp is a metal rod, a glass rod or a ceramic rod.
7. The air-cooled cladding-pumped high-power optical fiber amplifier according to any one of claims 2 to 4, wherein the rare-earth-doped optical fiber is welded at the left end and the right end thereof to end caps respectively, the fixture is a screw, each of the end caps is provided with a first bolt hole, the gas-guiding tube is provided with a second bolt hole corresponding to the first bolt hole in one-to-one correspondence, and the screw is inserted into the first bolt hole and the second bolt hole to bolt the gas-guiding tube to the end caps.
8. The air-cooled cladding-pumped high-power optical fiber amplifier according to claim 1, wherein said gas is selected from air, nitrogen or inert gas.
9. The air-cooled cladding-pumped high power fiber amplifier of claim 1, wherein the core has a diameter of more than 5 μm, the cladding has a diameter of more than 100 μm, and the core is doped with any one of the rare earth elements erbium, ytterbium, neodymium or holmium.
10. The air-cooled cladding-pumped high power fiber amplifier of claim 1, wherein said rare-earth doped fiber is a polarization-maintaining fiber or a non-polarization-maintaining fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037397.3A CN112134127B (en) | 2020-09-28 | 2020-09-28 | Air-cooled cladding pump high-power optical fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011037397.3A CN112134127B (en) | 2020-09-28 | 2020-09-28 | Air-cooled cladding pump high-power optical fiber amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112134127A CN112134127A (en) | 2020-12-25 |
| CN112134127B true CN112134127B (en) | 2022-02-15 |
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